Well to say i will try to be clear :
-The art style is nice, not to much detailthat is requested by the artist, soft to the eye and eye cather by the animation
-Posture, ar, shoulder and hand position, the inclination of the head following the moving movement for aiming with a very good timing.
-Face expression that really give us the presence of a target straigh up the glass.
-Good alignement between the head eye and reticular.
-Lovely face for a lovely girl with an attractive gun
-Redhead <3 yes i like it.
-Even if there is a lot of art between a girl aiming with a gun, you made a gif out of it and the work behind is truly hard you got that point
-Sun position and shame don't really fit, anyway not really con because it give attention to the spectator. It doesn't fit with the skyscraper and the long building at the right of the women, backroung aren't what you love i suppose
-The finger on the trigger : when you use a gun properly, you never stay your finger on the trigger, that's how accident happen, never because accidentaly you can push it while you are aiming
-A little more details in the background would be nice
-Talking about background you kinda done it in the hurry, the two doors arent aligned (parrallel) to the floor, look the first door and the second one, not good
On a final sentence :
Even if some mistakes are done, you give life to this beautifull girl with her weapon and really inspire imagination of a story behind it that really trigger* us, maybe you can evolve it
it would be awesome. But you deserve a pretty well done job a behind my screen i applause this post.